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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '028ad687b768ec7cad4d93a7c3a0b76aeddf02fab3029fcddfb94f98f6e45122' 
  AND token = 'OWuSrrzbFeVFxBREx4Gdq06bcChwv/fYlVWpaM4NXuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01492

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}